servlet表单处理使用GET()方法实例 及复选框
1、web目录下的hello.html
html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>菜鸟教程（runoob.com）title>
head>
<body>
<form action="HelloForm" method="get">
网址名：<input type="text" name="name">
<br />
网址：<input type="text" name="url">
<input type="submit" value="提交">
form>
body>
html>
2、src下的HelloForm.java
public class HelloForm extends HttpServlet { private static final long serialVersionUID = 1L; public HelloForm(){ super(); } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException,IOException{ //设置响应内容类型 response.setContentType("text/html;charset=UTF-8"); PrintWriter out = response.getWriter();//准备输入 String title ="使用get方法读取表单数据"; //表单输入的数据中有中文则需要转码 String name = new String(request.getParameter("name").getBytes("ISO8859-1"),"UTF-8"); String doType = " \n"; out.println(doType + "\n" + "" </span>+ title +<span style="color:#008000;font-weight:bold;">" \n" + "\"#f0f0f0\">\n" + "\"center\"> "+ title + "
\n" + "\n" + "
站点名:" + name +"\n"+ " 网址:" + request.getParameter("url")+"\n"+ " \n" + ""); } protected void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException{ doGet(request,response); } } 2、设置一下web-xml
<servlet> <servlet-name>HelloFormservlet-name> <servlet-class>HelloFormservlet-class> servlet> <servlet-mapping> <servlet-name>HelloFormservlet-name> <url-pattern>/HelloFormurl-pattern> servlet-mapping>
3、试输入网址名和网址，然后点击"提交"按钮，Gif 演示如下：
读取所有的表单参数
1、ReadParams.javapublic class ReadParams extends HttpServlet { private static final long serialVersionUID = 1L; public ReadParams(){ super(); } public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException,IOException{ response.setContentType("text/html;charset=UTF-8"); PrintWriter out = response.getWriter(); String title = "读取所有的表单数据"; String docType = "\"-//w3c//dtd html 4.0 " + "transitional//en\">\n"; out.println(docType + "\n" + "\"utf-8\">" </span>+title +<span style="color:#008000;font-weight:bold;">" \n" +"body bgcolor=\"#f0f0f0\">\n" + "\"center\">" + title +"
" + "\"100%\" border=\"1\" align=\"center\">\n" + "
\n\"#949494\">\n" + " \n");参数名称 参数值 \n"+ "Enumeration paramNames = request.getParameterNames(); while(paramNames.hasMoreElements()){//刚开始的时候Enumeration的游标指向-1，所以可以全部遍历 String paramName = (String)paramNames.nextElement(); out.println(""); } out.println("\n " + paramName + " \n"); String[] paramValues = request.getParameterValues(paramName); //读取单个值的数据 if(paramValues.length == 1){ String paramValue = paramValues[0]; if(paramValue.length() == 0) out.println("没有值 "); else out.println("" + paramValue +" "); } else{//读取多个数据 out.println(""); } out.println(" "); for(int i = 0;i < paramValues.length;i++){ out.println("
- "
+paramValues[i]); } out.println("